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snow leopard 10.6.8 upgraded to Mountain Lion 10.8.3 successful
Just an fyi, I did a full back with carbon copy cloner to
another bootable drive in case.Then I just install/upgraded my existing snow leopard install
with mountain lion.Went smooth as can be.
No random beach balls or other funny stuff.
Saved 2 days of working doing a clean install.
I think apple has gotten better at the O/S upgrade process.